A manometer is a device used to measure the pressure of gases or liquids. It typically consists of a U-shaped tube filled with a liquid, such as mercury or water. When pressure is applied to one side of the tube, the liquid level changes, allowing for the measurement of pressure differences. Manometers are commonly used in laboratories and various industrial applications. There are different types of manometers, including U-tube manometers, digital manometers, and differential manometers. Each type serves specific purposes, such as measuring atmospheric pressure or comparing pressures in two different systems. Manometers are essential tools in fields like engineering and meteorology.